From dbf65fecbaa86335d4beb44c87ad2638e8a2f80d Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 29 Oct 2026 14:03:28 +0100
Subject: Fixing lights_out

---
 c++/.nix/derivation.nix |  4 ++--
 c++/lights_out.cpp      | 48 +++++++++++++++++++++++++++++++++++-------------
 2 files changed, 37 insertions(+), 15 deletions(-)

(limited to 'c++')

diff --git a/c++/.nix/derivation.nix b/c++/.nix/derivation.nix
index a47b023..e3f712d 100644
--- a/c++/.nix/derivation.nix
+++ b/c++/.nix/derivation.nix
@@ -15,8 +15,8 @@ stdenv.mkDerivation {
 		EM_CACHE=$TMPDIR/emscripten_cache
     emcc lights_out.cpp \
       -s WASM=1 \
-      -s EXPORTED_FUNCTIONS='["_fake_main"]' \
-      -s EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' \
+      -s EXPORTED_FUNCTIONS='["_solve_lights_out_dispatch","_malloc","_free"]' \
+      -s EXPORTED_RUNTIME_METHODS='["ccall","cwrap","HEAPU8"]' \
       -o lights_out.js
 	'';
 
diff --git a/c++/lights_out.cpp b/c++/lights_out.cpp
index 7dc8dc1..b35c4ee 100644
--- a/c++/lights_out.cpp
+++ b/c++/lights_out.cpp
@@ -155,20 +155,42 @@ int solve_lights_out(const Vec<MM,NN>& b, Vec<MM,NN>& x){
     return 0;
 }
 
-extern "C"{
-int solve_lights_out_dispatch(int8_t* b, int m, int n){
-	if ( m == 3 and n == 3){
-		Vec<3,3> b_raw;
-		Vec<3,3> x;
-
-		auto rc = solve_lights_out<3,3>(b_raw,x);
-		if(rc == 0) {
-			for(point<3,3> i{}; i.x < 3 && i.y < 3; i.inc()){
-				auto is = i.stride();
-				b[is] = x[is];
-			}
+template<uint64_t M, uint64_t N>
+int solve_lights_out_interconnect(int8_t* b_raw){
+	Vec<M,N> b;
+
+	for(point<M,N> i{}; i.x < M && i.y < N; i.inc()){
+		auto is = i.stride();
+		b[is] = b_raw[is];
+	}
+
+	Vec<M,N> x;
+
+	auto rc = solve_lights_out<M,N>(b,x);
+	if(rc == 0) {
+		for(point<M,N> i{}; i.x < M && i.y < N; i.inc()){
+			auto is = i.stride();
+			b_raw[is] = x[is];
 		}
-		return rc;
+	}
+	return rc;
+}
+
+extern "C"{
+int solve_lights_out_dispatch(int8_t* b_raw, int m, int n){
+
+	if ( m == 1 and n == 1){
+		return solve_lights_out_interconnect<1,1>(b_raw);
+	}else if( m == 2 and n == 2){
+		return solve_lights_out_interconnect<2,2>(b_raw);
+	}else if( m == 3 and n == 3){
+		return solve_lights_out_interconnect<3,3>(b_raw);
+	}else if( m == 6 and n == 6){
+		return solve_lights_out_interconnect<6,6>(b_raw);
+	}else if( m == 7 and n == 7){
+		return solve_lights_out_interconnect<7,7>(b_raw);
+	}else if( m == 8 and n == 8){
+		return solve_lights_out_interconnect<8,8>(b_raw);
 	}
 	return -2;
 }
-- 
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